pH & buffers Flashcards
1
Q
Number of moles equation
A
Number of moles = mass in grams / molecular weight
2
Q
Mass equation
A
Mass (g) = Molarity (M) x molecular weight x volume (L)
3
Q
How does the acid dissociation constant (Ka) correlate to the strength of an acid? [2 marks]
A
- Higher Ka = stronger acid (equilibrium to the right)
- Ka is a measurement of the position of an equilibrium
4
Q
pH equation (from H+ concentration)
A
pH = -log[H+]
5
Q
Ka equation
A
Ka = [H+][A-] / [HA]
6
Q
Henderson-Hasselbach equation
A
pH = pKa + log [A-}/[HA}
